In MediaWiki's Newsletter extension, fix a warning after removing subscription
This task is about MediaWiki's Newsletter extension.
Steps to reproduce:
Subscribe to a newsletter
Unsubscribe - and enable all warnings.
Warning: filesize(): stat failed for /var/www/Special:Newsletter/92/unsubscribe in /var/www/core/core/includes/debug/MWDebug.php on line 407
This warning should not happen.
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